中国长江中游地区湖北、湖南西部下古生界牛蹄塘地层页岩气保存条件及影响因素实例研究

IF 1.2 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Geofluids Pub Date : 2024-01-08 DOI:10.1155/2024/6637899
Shengling Jiang, Qinghua Zhou, Yanju Li, Rili Yang
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引用次数: 0

摘要

下寒武统牛蹄塘地层(Є1n)是我国长江中上游地区广泛发育的页岩气目标储层,具有分布广、厚度大、有机碳丰度高等特点。但勘探研究程度相对较低。本文在大量岩芯取样、实验测试结果、钻探和野外露头调查的基础上,探讨了页岩气的生成能力、含气量和气体成分。然后从构造运动、断层发育、构造样式、热演化程度等方面系统分析了页岩气的保存条件。结果表明,富含有机质的页岩发育于Є1n地层的中下部,厚度在40-150米之间,TOC含量在0.4%-14.64%之间。它具有热演化程度高(Ro 值从 1.92%到 5.74%不等)、气体含量低和氮含量高(70%井)的不利特征。Є1n页岩气的保存条件复杂。Є1n地层具有良好的顶底板条件,但在侏罗纪-白垩纪Є1n页岩主要产气高峰之后,燕山运动最强烈的构造活动导致保存条件变差(断层发育,盖岩断裂)。延伸至地表的巨大断层是在伸展环境下的构造运动形成的,其构造样式和发育程度是影响Є1n 页岩气保存条件的主要因素。此外,Є1n 页岩的高热演化对保存条件也有一定影响。因此,远离大断层(>2.0 km)、局部构造活动和构造变形较弱的稳定区域是Є1n地层页岩气保存的有利区域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Case Study on Preservation Conditions and Influencing Factors of Shale Gas in the Lower Paleozoic Niutitang Formation, Western Hubei and Hunan, Middle Yangtze Region, China

The Niutitang Formation of the lower Cambrian (Є1n) is a target reservoir of shale gas widely developed in China’s Middle-Upper Yangtze region, with the characteristics of being widely distributed, having a big thickness and highly organic carbon abundance. However, the exploration and research degree are relatively low. Based on extensive core sample, experimental test results, drilling, and field outcrop surveying, the shale gas generation capacity, gas content, and gas composition are discussed. The preservation conditions of shale gas are then systematically analyzed from the aspects of tectonic movement, fault development, structural style, and thermal evolution degree. The results show that the organic-rich shale with a thickness ranging from 40 to 150 m developed in the mid-lower part of the Є1n Formation, with the TOC content values ranging from 0.4% to 14.64%. While it has unfavorable characteristics of a high thermal evolution, with Ro values ranging from 1.92% to 5.74%, a low gas content and a high nitrogen content (70% wells). The Є1n shale gas has complex preservation conditions. The Є1n Formation has good roof-to-floor conditions, but after the main gas generating peak of the Є1n shale during the Jurassic–Cretaceous, the most intensive tectonic activity of the Yanshan movement resulted in poor preservation conditions (faults developed and cap rock fractured). The huge faults extended to the surface are formed due to tectonic movement in an extensional environment, and the structural style and development are the main factors affecting the preservation conditions of the Є1n shale gas. Additionally, the high thermal evolution of the Є1n shales also has a certain impact on the preservation conditions. Therefore, the stable area far from large faults (>2.0 km), with weak local tectonic activity and tectonic deformation, is the favorable area for shale gas preservation in the Є1n Formation.

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来源期刊
Geofluids
Geofluids 地学-地球化学与地球物理
CiteScore
2.80
自引率
17.60%
发文量
835
期刊介绍: Geofluids is a peer-reviewed, Open Access journal that provides a forum for original research and reviews relating to the role of fluids in mineralogical, chemical, and structural evolution of the Earth’s crust. Its explicit aim is to disseminate ideas across the range of sub-disciplines in which Geofluids research is carried out. To this end, authors are encouraged to stress the transdisciplinary relevance and international ramifications of their research. Authors are also encouraged to make their work as accessible as possible to readers from other sub-disciplines. Geofluids emphasizes chemical, microbial, and physical aspects of subsurface fluids throughout the Earth’s crust. Geofluids spans studies of groundwater, terrestrial or submarine geothermal fluids, basinal brines, petroleum, metamorphic waters or magmatic fluids.
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